Uptime Monitoring for E-commerce: A Complete Checklist

E-commerce downtime is uniquely painful. Unlike SaaS products where users might try again later, abandoned shopping carts rarely convert. Shoppers who hit a 503 error during checkout go to a competitor — often permanently. For e-commerce teams, every minute of downtime is a direct, measurable revenue loss.

This checklist covers every endpoint and failure mode that e-commerce operations should monitor, plus the alert configurations that give you the fastest possible response time.

The E-Commerce Monitoring Stack

E-commerce monitoring requires coverage at multiple layers:

1. Storefront layer — Pages users interact with directly
2. API layer — Backend services powering the storefront
3. Payment layer — Payment gateway integrations
4. Infrastructure layer — CDN, DNS, SSL
5. Third-party dependencies — Inventory systems, shipping APIs, tax services

Missing any layer means blind spots that will eventually cost you.

Storefront Layer Monitoring Checklist

Homepage

• URL: https://yourstore.com
• Check interval: 1 minute
• Keyword check: Your store name or a prominent page element
• Response time threshold: Alert if > 3 seconds
• Why: The front door to your store; primary SEO signal

Category Pages

• URLs: Your top 3-5 category pages by traffic
• Check interval: 5 minutes
• Keyword check: Category name
• Why: Second most-trafficked page type; often served from cache

Product Detail Pages

• URL: Your highest-converting product pages
• Check interval: 5 minutes
• Keyword check: "Add to Cart" button text
• Why: Add to Cart failures are a common failure mode (cart service issues)

Cart Page

• URL: https://yourstore.com/cart
• Check interval: 1-2 minutes
• Keyword check: Cart-specific element
• Why: Cart abandonment spikes if this page is slow or broken

Checkout Flow

• URLs: Each step of your checkout process
• Check interval: 1 minute
• Type: Multi-step synthetic transaction for full coverage
• Why: Highest priority page in the store — where revenue is realized

Order Confirmation Page

• URL: Your order confirmation template
• Check interval: 5 minutes
• Why: Confirms the full transaction loop is working

API Layer Monitoring Checklist

Product API

GET /api/v1/products/health
Expected: 200 OK with { "status": "healthy" }
Interval: 1 minute

Cart/Basket API

GET /api/v1/cart/health
Expected: 200 OK
Interval: 1 minute

Inventory API

GET /api/v1/inventory/health
Expected: 200 OK
Interval: 2 minutes

Search API

GET /api/v1/search?q=test
Expected: 200 OK with results array
Interval: 2 minutes
Note: Search outages cause significant revenue loss through reduced product discovery

Recommendation Engine

GET /api/v1/recommendations/health
Expected: 200 OK
Interval: 5 minutes
Note: Lower priority; degrade gracefully if this fails

Payment Layer Monitoring Checklist

Your Payment Gateway Health

Monitor the health status pages of your payment providers:

| Provider | Status URL | |----------|-----------| | Stripe | https://status.stripe.com/api/v2/status.json | | PayPal | https://www.paypalobjects.com/... | | Braintree | https://status.braintreepayments.com/api/v2/status.json | | Square | https://issquareup.com/api/v2/status.json |

Add these as external monitors so you know immediately when payment provider issues are causing checkout failures — not your own code.

Payment Webhook Receiver

POST endpoint that receives payment confirmations
Expected: 200 OK within 5 seconds
Interval: Verify with test webhooks every 15 minutes
Why: Webhook failures can cause order confirmation delays or missed revenue

Infrastructure Layer Monitoring

SSL Certificate

• Alert at: 30, 14, 7 days before expiry
• Check TLS version: Reject TLS 1.0/1.1
• Check cipher suites: Alert on deprecated ciphers
• Why: SSL expiry causes immediate, complete revenue loss

DNS

• Monitor: DNS resolution of your primary domain
• Alert on: Resolution failure, unexpected IP change, TTL anomalies
• Interval: 1 minute
• Why: DNS failures affect 100% of users instantly

CDN Health

• Monitor: CDN-specific URLs for your assets
• Check from: Multiple geographic locations
• Why: CDN failures can cause slow page loads even when origin is healthy

Peak Traffic Preparation Checklist

Before Black Friday, Cyber Monday, or any major sale:

• [ ] Reduce alert thresholds (response time, error rate) — normal thresholds may not catch degradation under load
• [ ] Add extra monitors for sale-specific pages
• [ ] Verify on-call schedule is staffed for entire sale period
• [ ] Disable non-essential monitoring to reduce noise
• [ ] Pre-configure maintenance windows for any planned scaling operations
• [ ] Test alert notification channels (fire a test alert to verify Slack, PagerDuty, SMS all work)
• [ ] Ensure status page is ready to post updates quickly
• [ ] Review runbooks — everyone should know the first 3 steps for each major failure type

Alert Configuration for E-Commerce

| Priority | Trigger | Alert Channel | Response Time | |----------|---------|---------------|--------------| | P0 | Checkout down | SMS + phone call | < 2 minutes | | P0 | Payment API down | SMS + phone call | < 2 minutes | | P1 | Homepage down | Slack + SMS | < 5 minutes | | P1 | Cart API down | Slack + SMS | < 5 minutes | | P2 | Search down | Slack | < 15 minutes | | P2 | Response time > 5s | Slack | < 15 minutes | | P3 | SSL expiry warning | Email | Next business day |

Revenue Impact Calculation Template

Use this template to calculate the business case for comprehensive monitoring:

Daily revenue: $X
Revenue per hour: $X / 24
Revenue per minute: (Revenue per hour) / 60

Estimated annual outage minutes without monitoring: Y
Estimated annual outage minutes with monitoring: Y × 0.3 (typically catch 70% faster)
Minutes saved per year: Y - (Y × 0.3) = Y × 0.7

Revenue protected annually: (Revenue per minute) × (Minutes saved)
Monitoring cost annually: $Z

ROI: ((Revenue protected - Monitoring cost) / Monitoring cost) × 100%

For a store doing $50,000/day and experiencing 120 minutes of annual downtime:

• Revenue per minute: ~$34.72
• Minutes saved with monitoring (70%): 84 minutes
• Revenue protected: $2,917
• AzMonitor Pro cost: $588/year
• ROI: 396%

AzMonitor's e-commerce-ready monitoring includes all the endpoint types above, plus built-in status pages for customer communication during outages. Start your free trial and protect your revenue before the next sale event.

See also our guide to monitoring Shopify stores for platform-specific configuration.